JPS63277434A - Emergency operation circuit of elevator device - Google Patents

Abstract

PURPOSE:To place an elevator at the nearest floor, by actuating an inverter in feeding the power to the control circuit of inverter from a battery through a DC intermediate section of the inverter in power failure. CONSTITUTION:A cage 25 of an elevator 21 is driven by an AC motor 22, which is controlled by an inverter 2 for variable speed and variable frequency. Between a rectification section 3 and an inverter section 5 of the inverter 2 a smoothing capacitor 4 is provided, in parallel to which a battery device 11 is provided. In power failure, an electromagnetic contactor 14 of the battery device 11 is closed and the smoothing capacitor 4 is changed by a battery 12. An electromagnetic contactor 15 is then closed and all the voltage of the battery 12 is applied to the capacitor 4. The power is thereby fed to an inverter control circuit 6 from the battery 12 and the inverter section 5 in stoppage resumes actuation, so that the elevator is operated to be placed at the nearest floor.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is such that the driving AC motor is operated by a variable voltage variable frequency inverter connected to a three-phase AC power source at a commercial frequency. This invention relates to an emergency operation circuit for an elevator device.

[Conventional technology]

Conventionally, an elevator apparatus whose drive motor is operated by an inverter for variable speed and variable frequency is, as shown in FIG. In an elevator apparatus in which a driving AC motor 33 is connected via a drive line 34, commercial frequency three-phase power from a three-phase AC power source 31 is converted to variable frequency three-phase power via an inverter 32 to the AC motor 33. Converted and powered car 3
Elevator equipment is known in which the smooth acceleration and deceleration operation of 6 is performed so that the elevator system operates without any impulse when leaving or landing on each landing floor.

[Problem that the invention seeks to solve]

However, in the conventional elevator system of this type, the control of the inverter 32 for variable speed variable frequency +1t1 circuit (
(not shown) also relies on Sanwa Den'rA31, which operates on a commercial frequency, to supply its required power, and for some reason -
If a power outage occurs in the three-phase AC power supply 31, the ability to control the inverter 32 is lost, so the elevator stops operating due to the power outage, and the car 36 is unable to move between the floors it should land on. In such a case, it is possible to operate the inverter 32 even for a short time to operate the AC motor and land the car 36 on the nearest floor so that the passengers can safely escape from the car 36. It's impossible.

Therefore, in the conventional elevator system, as a countermeasure against this problem, as illustrated in FIG.
An emergency operation circuit consisting of a direct 27iE motor 38 that can be connected to the The car is connected to the hoisting machine 35, the electromagnetic contactor 39 is closed, and the DC motor 38 is operated using the storage battery 40 as a power source, and the car 36 is moved to the nearest floor and landed on the floor, allowing the passengers to escape safely. I am doing what I can. As a result, in the conventional elevator system, the three-phase AC power supply 3 for operating the elevator is
Inverter 3 for variable speed variable frequency powered from 1
In addition to the regular operation circuit consisting of the AC motor 2 and the AC motor 33, it is necessary to separately install an emergency operation circuit consisting of the storage battery 40 and the DC motor 38 in case of a power outage. The problem is that it requires significant space and cost.

The present invention solves the above-mentioned problems associated with an emergency operation circuit for safely transporting passengers in a car to the nearest floor in the event of a three-phase AC power outage in a conventional elevator system, and uses simple means to restore the normal operation circuit. An object of the present invention is to provide an emergency operation circuit for an elevator system that does not require a separate emergency operation circuit in addition to the operation circuit of the present invention, and which reduces space and economic burden.

[Means for solving problems]

In order to achieve the above object, the present invention provides an emergency operation circuit for an elevator system in which the driving AC motor is operated by a variable speed variable frequency inverter connected to a commercial frequency three-phase AC power source. A storage battery is connected to the DC intermediate circuit of the inverter via a necessary electromagnetic contactor, resistor, etc., and the smoothing capacitor of the DC intermediate circuit is charged in the event of a power outage of the three-phase AC power supply. The control circuit of the inverter is operated by the voltage of the capacitor, so that the inverter can be operated.

[Effect]

By configuring the emergency operation circuit of the elevator apparatus according to the present invention as described above, even if a power outage occurs in the regular three-phase AC power source, the control circuit of the inverter can be operated by the storage battery via the DC intermediate section of the inverter. supplying the required power to operate the inverter section of the inverter,
The alternating current motor can be operated so that the elevator car, which is stopped between landing floors, is brought to the nearest floor.

〔Example〕

Next, the present invention will be explained in detail based on embodiments shown in the drawings.

In the elevator system according to the present invention, as illustrated in FIG. The three-phase AC power of the commercial frequency of the phase AC power supply 1 is composed of a rectifying section 3, a DC intermediate circuit section consisting of a smoothing capacitor 4, and an inverter section 5,
A control circuit 6 supplied with the required power from the three-phase AC power supply 1
The car 25 is smoothly accelerated and decelerated by supplying variable frequency power via the voltage type inverter 2, which is controlled by the voltage type inverter 2. This is the same as in the case of conventional elevator systems.

However, in the elevator system according to the present invention, the first
As illustrated in the figure, the output terminal of a storage battery device 11 is formed by connecting a charging current suppressing resistor 13 to which a short-circuiting electromagnetic contactor 15 is connected in parallel and a switching circuit electromagnetic contactor 14 to a storage battery 12 in series. , is connected to the DC intermediate circuit section of the inverter 2 for variable speed variable frequency to charge the smoothing capacitor 4, and the output voltage from both terminals of the smoothing capacitor 4 is supplied to the inverter control circuit 6 from the three-phase AC power supply l. A power supply circuit is provided in parallel with the circuit of the rectifier 7, which supplies current to the inverter control circuit 6 when the potential is higher than the output voltage of the rectifier 7.

In the elevator system according to the present invention configured as described above, if the three-phase AC power supply l is interrupted for some reason, the voltage of the DC intermediate circuit section drops, so that the control circuit 6 detects an undervoltage. Since the operation of the inverter unit 5 is then stopped, the drive motor 22 of the elevator, which has lost its motive power, also stops operating and a failure signal is output at the same time. This fault signal causes the mechanical brake of the elevator to operate through an appropriate means, and the car 25 is completely stopped.
Since the car 25 is locked, it is possible that the car 25 comes to a halt midway between the floors on which it should land. In that case, in the elevator system according to the present invention, after confirming that the car 25 has stopped midway, the open circuit electromagnetic contactor 14 of the storage battery device 11 is closed by appropriate means, and the charging current suppressing resistor 13 is closed. After approximately 1 second of charging time of the capacitor 4 has elapsed, the electromagnetic contactor 15 is closed and the charging current suppressing resistor 13 is charged by the storage battery 12 via the storage battery 12.
is short-circuited so that the full voltage of the storage battery 12 is applied to the capacitor 4. As a result, since the voltage of the DC intermediate circuit is established, current is supplied from the capacitor 4 to the inverter control circuit 6 via the diode 8 instead of the rectifier 7 whose AC power supply 1 has already been cut off, and the control The circuit operates and the inverter unit 5 is operated. At the same time, when the mechanical brake of the elevator is released, the AC motor 22 starts again in response to the output of the inverter section 5, and the reduction gear 2
3. The car 25, which is stopped midway between the landing floors, can be carried to the nearest landing floor via the hoisting machine 24, and the passengers can safely escape.

In the emergency operation circuit for the elevator system according to the present invention, as described above, although it is necessary to provide the storage battery device 11, there is no need for any emergency electric motors other than the regular AC electric motor II 22.

〔Effect of the invention〕

As explained above, the present invention provides an emergency operation circuit for an elevator apparatus in which the driving AC motor is operated by a variable speed variable frequency inverter connected to a commercial frequency three-phase AC power source. A storage battery is connected to the DC intermediate circuit section of the inverter via a necessary electromagnetic contactor, resistor, etc., so that the smoothing capacitor of the DC intermediate circuit section is charged in the event of a power outage of the Sanwa AC ft power supply, By operating the control circuit of the inverter using the voltage of the capacitor to enable the inverter to operate, it is necessary to add a storage battery device to the commonly used variable speed variable frequency inverter, but in the case of conventional elevator equipment. Since there is no need to add an emergency motor as in the case of the above, there is an effect that the space and cost required for installing the elevator system can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic wiring diagram illustrating an elevator apparatus and its emergency operation circuit according to the present invention, and FIG. 2 is a schematic wiring diagram illustrating a conventional elevator apparatus and its emergency operation circuit.

Claims (1)

[Claims] 1) In an emergency operation circuit for an elevator system in which the AC motor for driving the elevator is operated by a variable speed variable frequency inverter connected to a commercial frequency three-phase AC power supply, the DC intermediate circuit section of the inverter A storage battery is connected to the inverter through a necessary electromagnetic contactor, resistor, etc., so that the smoothing capacitor of the DC intermediate circuit section is charged in the event of a power outage of the three-phase AC power supply, and the voltage of the capacitor is used to charge the smoothing capacitor of the inverter. An emergency operation circuit for an elevator system, characterized in that the control circuit is operated to operate the inverter.